Migrating Red Hat Linux subscription to Oracle

By |2019-10-07T08:38:49+02:00March 19th, 2016|Categories: Architecture|Tags: , , , , , |

I never realized in depth the difference between a Linux subscription and a license. Linux is open source, so the software itself is for free. No license to use it is required. But when you buy a Linux support subscription, you are legally entitled to download the ISO images of […]

A short guide to networking in Virtual Box with Oracle Linux inside.

By |2019-09-28T16:45:51+02:00August 17th, 2014|Categories: Database|Tags: , , , , , , |

This post is intended to be a dummy guide, best practices, or whatever you call it…   about setting up a network while working with virtual boxes on a desk- or laptop. I was setting up a virtual box environment with several Virtual Boxes on my laptop, and as I’m not […]

Configuring a private DNS server on Openfiler for use with Oracle RAC 12C on Virtual Boxes

By |2019-09-28T18:53:40+02:00June 7th, 2014|Categories: Database, RAC|Tags: , , , , |

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This post has already been published in the past on the AMIS-blog.

To build an Oracle 12C RAC database – on Virtual Boxes – there’s […]

My project with Dbvisit Standby – basics

By |2019-10-08T22:19:26+02:00March 31st, 2013|Categories: Database, Standby|Tags: , , , , |

A while ago I made a promise to take a look at the product Dbvisit, found out this is not the product, but just the firm Dbvisit. The product I’m about to install is called officially ‘Dbvisit Standby‘. There’s […]

Multipath timeout issues with extended 11.2.0.2 – cluster setup. Part II

By |2019-10-08T22:15:23+02:00January 3rd, 2012|Categories: Database, RAC|Tags: , , , , , |

The second and final post about an issue with a RAC-configuration with two SAN's. Problem was a i/o-freeze of minutes when crashing one of the two SAN's. The first post I ended with a 'cliffhanger' because we had a solution, but not tested it yet.

Multipath timeout issues with extended 11.2.0.2 – cluster setup part I

By |2019-10-08T22:16:16+02:00August 25th, 2011|Categories: Database, RAC|Tags: , , , , , |

With this setup we are facing the issue that if we loose a complete SAN, the IO’s to the ASM diskgroups will be blocked for approx 3 till 4 minutes. Oracle does not like this. After 70 seconds after a freeze, rdbms is starting to reboot (expected behaviour).

Metric ‘swap utilisation(%)’ on Grid Control node too high.

By |2019-10-07T08:35:29+02:00August 12th, 2011|Categories: grid control, Oracle Enterprise Manager|Tags: , , , , , |

The metric 'swap utilisation (%)' on the node where Grid Control resides, shows permanently a very hig value. Red Hat Linux, 64-bits, 32GB RAM, 4GB swap. Adding 4GB to the swap-file solved the problem.